Jeez Mike you want a book full this morning!
#1 No idea if there is a size limit.
#2 You have 10 good upvotes a day (more than that and it gets watered down will drop a link for a great discussion about it in here from @bashadow in a discussion with the original poster.
#3 Yes upvote those sharing and those willing to get into a discussion helping you grow here.
#4 Nope steemit blows fb out of the water! The upvote is not the like button!
#5 We are all learning so there is no dumb or noob stuff! If ya don't know you ask!

https://steemit.com/steemit/@intelliguy/where-did-that-person-go-why-did-they-not-come-back-and-visit-your-blog-losing-votes-i-will-tell-you-why